A shampoo bottle that empties completely every last drop

Coatings that allow ketchup and other gel-like liquids to easily slide down plastic bottle interiors have been around for many years. Finding something that prevents liquid soap from clinging to the inside of a bottle has proven more elusive, because the qualities that make soap "soapy" also make it clingy to plastic. But researchers at The Ohio State University have created a microscopic texture that repels soap products, as reported in the journal Philosophical Transactions of the Royal Society on June 27.

From Ohio State University newsroom:

The technique involves lining a plastic bottle with microscopic y-shaped structures that cradle the droplets of soap aloft above tiny air pockets, so that the soap never actually touches the inside of the bottle. The y structures are built up using much smaller nanoparticles made of silica, or quartzan ingredient in glasswhich, when treated further, wont stick to soap.